Multifilter rotating shadowband radiometer calibration for spectral aerosol optical depth retrievals over São Paulo City, Brazil

Rosário, Nilton do; Yamasoe, Márcia Akemi; Sayão, A. C.; Siqueira, Ricardo Almeida de

doi:10.1364/ao.47.001171

Cited by 8 publications

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“…This parameterization was based on measurements of broadband and narrowband solar global and diffuse irradiance components performed with a multifilter rotating shadowband radiometer (MFRSR; . With the narrowband measurements centered at 415, 670, 870, and 1036 nm, AOD was estimated following the methodology of and Rosário et al (2008). The measurements were performed at The diffuse fraction of broadband irradiance reaching the surface as a function of AOD at a 670 nm wavelength for distinct optical air mass intervals (m), expressed as a ratio of the optical path length relative to the path length at zenith (Fig.…”

Section: Biosphere Model: the Joint Uk Land Environment Simulator (Jumentioning

confidence: 99%

Modeling the radiative effects of biomass burning aerosols on carbon fluxes in the Amazon region

et al. 2017

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Abstract. Every year, a dense smoke haze covers a large portion of South America originating from fires in the Amazon Basin and central parts of Brazil during the dry biomass burning season between August and October. Over a large portion of South America, the average aerosol optical depth at 550 nm exceeds 1.0 during the fire season, while the background value during the rainy season is below 0.2. Biomass burning aerosol particles increase scattering and absorption of the incident solar radiation. The regional-scale aerosol layer reduces the amount of solar energy reaching the surface, cools the near-surface air, and increases the diffuse radiation fraction over a large disturbed area of the Amazon rainforest. These factors affect the energy and CO 2 fluxes at the surface. In this work, we applied a fully integrated atmospheric model to assess the impact of biomass burning aerosols in CO 2 fluxes in the Amazon region during 2010. We address the effects of the attenuation of global solar radiation and the enhancement of the diffuse solar radiation flux inside the vegetation canopy. Our results indicate that biomass burning aerosols led to increases of about 27 % in the gross primary productivity of Amazonia and 10 % in plant respiration as well as a decline in soil respiration of 3 %. Consequently, in our model Amazonia became a net carbon sink; net ecosystem exchange during September 2010 dropped from +101 to −104 TgC when the aerosol effects are considered, mainly due to the aerosol diffuse radiation effect. For the forest biome, our results point to a dominance of the diffuse radiation effect on CO 2 fluxes, reaching a balancePublished by Copernicus Publications on behalf of the European Geosciences Union. 14786 D. S. Moreira et al.: Modeling the radiative effects of biomass burning aerosols of 50-50 % between the diffuse and direct aerosol effects for high aerosol loads. For C3 grasses and savanna (cerrado), as expected, the contribution of the diffuse radiation effect is much lower, tending to zero with the increase in aerosol load. Taking all biomes together, our model shows the Amazon during the dry season, in the presence of high biomass burning aerosol loads, changing from being a source to being a sink of CO 2 to the atmosphere.

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Section: Biosphere Model: the Joint Uk Land Environment Simulator (Jumentioning

confidence: 99%

Modeling the radiative effects of biomass burning aerosols on carbon fluxes in the Amazon region

et al. 2017

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“…This parameterization was based on measurements of broad and narrowband solar global and diffuse irradiance components performed with a Multi-filter Rotating Shadow-band Radiometer (MFRSR -Harrison et al, 1994). With the narrowband measurements, centered at 415, 670, 870 and 1036 nm, AOD was estimated following the methodology of and Rosário et al (2008). The measurements were performed at Reserva Biológica do Jaru, RO (-10.145 • , -61.908 • ) during the dry/smoke season of 2007.…”

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Modelling the radiative effects of smoke aerosols on carbon fluxes in Amazon

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Longo

Freitas

et al. 2017

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Abstract. Every year, a dense smoke haze of regional dimensions covers a large portion of South America originated from fire activities in the Amazon Basin and Central parts of Brazil during the dry/biomass-burning season between August and October. Over a large portion of South America, the average aerosol optical depth at 550&#8201;nm exceeds 1.0 during the fire season while the background value during the rainy season is below 0.2. Smoke aerosol particles increase scattering and absorption of the incident solar radiation. The regional-scale aerosol layer reduces the amount of solar energy reaching the surface, cools the near surface air, and increases the diffuse radiation fraction over a large disturbed area of the Amazon rainforest. These factors affect the energy and CO2 fluxes at the surface. In this work, we applied a fully integrated atmospheric model to assess the impact of smoke aerosols in CO2 fluxes in the Amazon region during 2010. We address the effects of the attenuation of the solar global radiation and the enhancement of the diffuse solar radiation flux inside the canopy. Our results indicated that the smoke aerosols led to an increase of about 22&#8201;% of the gross primary productivity of Amazonia, 9&#8201;% of plant respiration and a decline in soil respiration from of 3&#8201;%. Consequently, Amazonia net ecosystem exchange during September 2010 dropped from +101 to &#8722;104&#8201;TgC when the aerosol effects were considered, mainly due to the aerosol diffuse radiation effect. For the forest biome, our results pointed to a dominance of the diffuse radiation effect on CO2 fluxes, reaching a balance of 50&#8201;% &#8211; 50&#8201;% between the diffuse and direct aerosol effects for high aerosol loads. For C3 grass type and cerrado, as expected, the contribution of the diffuse radiation effect is much lower, tending to zero with the increase of aerosol load. That is, the Amazon during the dry season, in the presence of high smoke aerosol loads, change from being a source to be a sink of CO2 to the atmosphere.

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“…As regiões Norte e Centro-Oeste do Brasil, a quais essas cidades pertencem, possuem um vegetação predominante de cerrado e floresta tropical, bem como inúmeras áreas de pastagens suscetíveis a queimadas durante a chamada estação seca (Maio-Outubro), apresentando um tipo de aerossol caracterísco durante essa época do ano [Echalar et al (1998), Artaxo et al (2002), Schafer et al (2002), Omar et al (2005), Cattrall et al (2005)], ajudando no processo de validação. A localidade de São Paulo (SP) foi escolhida não só por possuir um fotômetro solar em funcionamento, mas também por ter um sistema Lidar de retroespalhamento elástico com algumas semelhanças ao sistema do CALIOP, e por ter uma atmosfera carregada de aerossóis provenientes de diversas fontes diferentes, além de ser alvo de diversos estudos para caracterização dos mesmos [Landulfo et al (2007[Landulfo et al ( , 2008[Landulfo et al ( , 2009, Miranda e Andrade (2005), Rosário et al (2008), Castanho et al (2008].…”

Section: Capítulo 6 Metodologiaunclassified

Validação dos dados do satélite CALIPSO utilizando um sistema lidar de retroespalhamento elástico e o fotômetro solar da rede AERONET

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Agradeço ao Eduardo pela orientação e amizade ao longo desses 4 anos. Por ter acreditado na minha capacidade em conduzir tal trabalho, por ter me incentivado nos momentos decisíveis e pelas inúmeras oportunidades de aprendizado ao longo desses anos. Pela imensa ajuda nas sugestões e discussões para melhoria desse trabalho. Ao Mark Vaughan por toda sua ajuda no desenvolvimento da metodologia desse trabalho, nas discussões de resultados, pelos artigos sugeridos, pela oportunidade criada para trabalharmos juntos e por ser um ótimo anfitrião e ter me recebido tão bem durante minha visita ao Centro de Pesquisas da NASA/Langley em Hampton.

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Multifilter rotating shadowband radiometer calibration for spectral aerosol optical depth retrievals over São Paulo City, Brazil

Cited by 8 publications

References 0 publications

Modeling the radiative effects of biomass burning aerosols on carbon fluxes in the Amazon region

Modeling the radiative effects of biomass burning aerosols on carbon fluxes in the Amazon region

Modelling the radiative effects of smoke aerosols on carbon fluxes in Amazon

Validação dos dados do satélite CALIPSO utilizando um sistema lidar de retroespalhamento elástico e o fotômetro solar da rede AERONET

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